CVE-2011-1093
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2011-1093 from the MITRE CVE dictionary dictionary and NIST NVD.
Statement
This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 4 as it did not include support for the DCCP protocol. Future updates in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG may address this flaw.
CVSS v2 metrics
| Base Score | 7.8 |
|---|---|
| Base Metrics | AV:N/AC:L/Au:N/C:N/I:N/A:C |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat Security Errata
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 5 (kernel) | RHSA-2011:0833 | 2011-05-31 |
| Red Hat Enterprise Linux 6 (kernel) | RHSA-2011:0498 | 2011-05-10 |
| MRG Grid for RHEL 5 Server (kernel-rt) | RHSA-2011:0500 | 2011-05-10 |
Affected Packages State
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise MRG 1.3 | realtime-kernel | Affected |
Mitigation
For users that do not run applications that use DCCP, you can prevent the dccp
module from being loaded by adding the following entry to the end of the
/etc/modprobe.d/blacklist file:
blacklist dccp
This way, the dccp module cannot be loaded accidentally, which may occur if an
application that requires DCCP is started. A reboot is not necessary for this
change to take effect but do make sure the module is not loaded in the first
place. You can verify that by running:
lsmod | grep dccp
You may also consider removing the CAP_SYS_MODULE capability from the current
global capability set to prevent kernel modules from being loaded or unloaded.
The CAP_SYS_MODULE has a capability number of 16 (see linux/capability.h). The
default value has all the bits set. To remove this capability, you have to
clear the 16th bit of the default 32-bit value, e.g. 0xffffff ^ (1 << 16):
echo 0xFFFEFFFF > /proc/sys/kernel/cap-bound
CVE description copyright © 2017, The MITRE Corporation